Dungeon Keeper part 1 & 2

I have also run into this problem. The Treehouse of Horror quests seem to have gotten out of sync with the Rebuild Springfield content. I have been stuck with the locked rebuild of the Android's Dungeon in my task book for almost a week now, after having the build Willie's Shack task stuck there for a day and a half. These tasks all seem to have the ultimate goal of having the the characters (Willie and Comic Book Guy) sleep in the bad dream house. It would be nice if this could be fixed so quests aren't showing up in the task book long before you can complete them. Still enjoying the game though.